Check damper



Jan. 1o, m28. www@ A. M., DQNUWAN GHECK DAMPER Filed Feb. l1. i927' Patented Jan. 10, 1928.

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Application filed February 11, 1927. Serial No. 167,394.

My invention has for its object to provide a check draft of the type commonly used in pipes that connect furnaces with chim` neys for short-circuiting the air to the chimney, thus shunting the furnace whereby the escape of fumes and gases from the furnaces will be entirely avoided, even though the check is left open when the furnace has received a charge of fuel. Y

As is well known in the art, the check draft or check damper is located in the chimney pipe leading from the furnace to the chimney and when fuel having a large proportion of volatile materials is fed into the furnace, the fumes and gases invariably escape from the smoke pipe through the check damper. Inasmuch as furnaces are operated by those who are not careful with reference to the check draft, the furnaces are frequently filled with the fuel and the check damper is left open with the result that the house soon becomes charged with the fumes of the gases. By my invention, I have provided a check damper which is s constructed that even though it is left open when the furnace has received a charge of fuel, yet the gases will not escape into the room. The invention may be applied to furnaces of different kinds, but it is particularly advantageous when` applied to the ordinary house furnace. To illustrate a practical application of my invention, I have se-` lected a check damper containing the invention and have shown it applied to a` house furnace. The check damper selected, and the house furnace, is shown in the accompnying drawings and is described hereina ter.

Fig. l of the drawings is a side elevation of the furnace and a side view of the check damper. Fig. 2 is a cross section of the check damper.

The furnace shown in the drawings is of a well-known type of house furnaces where in hot air is used for heating the house. It is yprovided with the usual smoke pipe 1 that leads to the chimney 2. The smoke pipe l has the usual horizontal extending portion 3 to which is connected the upwardly extending portion 4l and the horizontally extending portion 5 that is connected to the chimney 2. Theportions 4 and 5 being connected by means of the elbow 6. The check dampers are usually connected at the outer end of the portion 3, but, when the furnace is charged `with a. fresh fuel supply, the smoke will pass out through t-he check damper if it is left open, which soon fills the house with fumes. In the construction shown in the drawings, the end of the portion 3 is connected with a downwardly extending pipe 7 and the check damper is lo* cated at the lower end of the pipe 7.

The pipe 7 is connected to the portion 3 by means of a suitable elbow 8 and the check damper 9 is preferably located in the same relative position on the end of the pipe 7 that it was located on the end of the portion 3 of the pipe 1. The check damper 9 is preferably connected to the pipe 7 through an elbow 10. The check `damper 9 is formed of a casting 11 which fits the end of the elbow that covers the end of the casting 11. Preferably the outer edge of the casting ll is inclined to the vertical and the door l2 rests upon the outer edge of the casting 1l when the check damper is closed. The check damper is usually opened and closed by means of a suitable cable 13.

When, therefore, a new charge of fuel is placed in the furnace, the fumes will pass directly up the portion 4 of the pipe l and cannot descend through the pipe 7. Consequently all of the fumes will pass tothe chimney 2. This is also aided by the temperature that the pipe 7 receives from the furnace, which produces an up draft through the pipe 7 and consequently none of the fumes can pass down the pipe 7 and enter the room.

Thus I have provided a means whereby the check damper may be used for short circuiting the air, that is, shunting the furnace and cutting off a greater part of the draft of the chimney from the furnace in the manner well-known in the art, or it may be used for causing the air to pass through the furnace by closing the check damper and yet the check damper is so constructed that, although fresh fuel may be applied to the hot fuel of the furnace, there will be no escape of fumes from the furnace even though the check damper is left open.

I claim:` y

In a check damper for a. furnace having a smoke pipe connected to the furnace and the chimney, a part ofthe smoke pipe exnected to the said elbow, a second elbow tending horizontally and a partofthe smoke turned lateral and connected to the said 10 l y pipe extending vertically from a central short pipe and adainper located at the end gortion of the first named part-g the said of the second elbow.

5 rst named part extending beyond the point In witness whereof, I have hereunto of connection with the second named part, signed my name to this speeication. anr elbow turned downward and connected to the first named part, a short pipe con- ALBERT M. DON OVAN 

